Security fears and violence shaped the world news agenda today. In Washington, part of the Pentagon was locked down after internal systems detected an air-quality problem, triggering a hazmat response, shelter-in-place orders and evacuations before officials later eased the alert without yet explaining the cause. Tensions were sharper in the Gulf of Oman, where India confirmed three of its sailors were killed in a U.S. strike on an oil tanker Washington says was carrying Iranian crude, prompting a strong diplomatic protest from New Delhi. In Belfast, there was a rare note of cautious relief as stabbing victim Stephen Ogilvie showed signs of improvement, even as the attack’s aftermath continued to fuel disorder and arrests. And in Toronto, a police officer was killed during a search tied to the earlier shooting at the U.S. consulate, underscoring how investigations into political violence can turn deadly with little warning.